Compared to spiral galaxies, elliptical galaxies have.
A.) More gas, redder colors, and less new star formation.
B.) Less gas, bluer colors, and more new star formation.
C.) More gas, bluer colors, and more new star formation.
D.) Less gas, redder colors, and less new star formation.
E.) Less gas, bluer colors, and more new star formation.
Ans: D.) Less gas, redder colors, and less new star formation.
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The first stage of Earth's evolution is _____
A) cratering B) basin formation C) differentiation D) slow surface evolution
All the constellations in the sky were created by the Greeks
a. True b. False Indicate whether the statement is true or false
The traditional "top-down" hypothesis of the formation of our galaxy cannot explain
a. why not all globular clusters are the same age. b. why the youngest globular clusters are in the outer halo. c. why the oldest stars are metal poor but not completely metal free. d. streams and rings of scattered stars in the halo. e. All of the other choices are correct.
What happens to the core of a star after a planetary nebula occurs?
A) It contracts from a protostar to a main-sequence star. B) It breaks apart in a violent explosion. C) It becomes a white dwarf. D) It becomes a neutron star. E) It can become either a neutron star or a black hole.